Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Variable resolution"”.
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A Low-Power, Variable-Resolution Analog-to-Digital Converter
… scenario rarely occurs. As a consequence, a high-resolution and subsequently high power ADC designed for the worst case is not required for most operating conditions. A solution to reduce the power dissipation of ADCs in wireless digital communications systems is to detect the current channel …
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Spatial Resolution Analysis of a Variable Resolution X-ray Cone-beam Computed Tomography System
… and implemented that can adaptively provide high resolution CT images for objects of different sizes. The new system, called Variable Resolution X-ray Cone-beam CT (VRX-CBCT) uses a CsI-based amorphous silicon flat panel detector (FPD) that can tilt about its horizontal (<em>u</em>) axis and …
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Designing and Developing an Alternative Implementation of the Digital Bathymetric Database, Variable Resolution (DBDB-V)
… of the Digital Bathymetric Database Variable Resolution (<em>DBDB-V</em>) that will allow efficient ingestion into Geospatial Information System (<em>GIS</em>). DBDB-V is a well-known storage facility for wide-reaching <em>bathymetry</em>. It is created, maintained, and extensively …
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Theoretical and Experimental Evaluation of Spatial Resolution in a Variable Resolution X-Ray Computed Tomography Scanner
<p>A variable resolution x-ray (VRX) computed tomography (CT) scanner can image objects of various sizes with greatly improved spatial resolution. The scanner employs an angulated discrete detector and achieves the resolution boost by matching the detector angulation to the scanner field of view …
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Analysis of Viewshed Accuracy with Variable Resolution LIDAR Digital Surface Models and Photogrammetrically-Derived Digital Elevation Models
… photogrammetric DEMs and LIDAR DSMs of varying resolution. A field survey of the locations was conducted to determine the accuracy of the visibility predictions and to gauge the extent to which the presence of surface features in the DSMs affected the accuracy. The use of different resolution …
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Development and Application of Computational Tools for the Study and Optimization of Variable Resolution X-ray (VRX) Computed Tomography Scanners
… aids for the design and implementation of Variable Resolution X-ray (VRX) CT scanners developed at the University of Tennessee, Memphis. VRX scanners take advantage of the “projective compression” principle that allows the same device to image objects of very different sizes with the same …
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Resolution limits and process latitude of comformable contact nano-lithography
… Lithography enables researchers to attain high-resolution lithographic patterning at manageable cost. This thesis characterizes the minimum resolvable feature size and process latitude of Conformable Contact Lithography. Beginning with a review of current lithographic patterning techniques, …
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Multi-Scale Modelling of Cold Regions Hydrology
… represents the landscape using a multi-scale, variable resolution surface mesh. It was found that this explicitly captured the spatial heterogeneity important for emergent behaviours and cold regions processes, and reduced the total number of computational elements by 50\% to 90\% from that of …
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Development and performance of a miniature, low cost mass spectrometer
… has been developed that is capable of unit resolution over a mass range of 10 to 50 AMU. The design of the mass spectrometer incorporates several new features that enhance the performance of the design over comparable instruments. An efficient ion source allows a relatively low power …
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Multi-volume high resolution RGB-D mapping with dynamic volume placement
We present a novel method for creating high-resolution 3D reconstructions using RGB-D cameras, such as the Microsoft Kinect. We demonstrate how such a technique can be used both for large scale mapping and high-resolution object detection. Our work consists of two core contributions. First, we …
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Quantifying Nanoscale Order in Amorphous Materials via Fluctuation Electron Microscopy
… of the structure of amorphous materials. Using variable resolution FEM we are able to extract a characteristic length of ordered regions in two different amorphous silicon samples. Having eliminated the noise contribution to the variance, we show here the first demonstration of a consistent …
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Fluctuation Electron Microscopy Investigations of Medium Range Order in a-Silicon and a-Silicon:hydrogen Thin Films
The first practical version of variable resolution fluctuation electron microscopy has been developed on the JEOL 2010F transmission electron microscope in the Center for Microanalysis of Materials, UIUC. This technique provides information on the spatial extent of the medium range order. …
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Simulating the Characteristics of Tropical Cyclones over the South-West Indian Ocean: Sensitivity to Model Horizontal Resolution
… of four global climate models and one variable-resolution climate model in simulating the characteristics of SWIO TC activity through both a climatological and individual event analysis, and investigates the influence of horizontal resolution on the simulated TC characteristics. The …
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A Smart Implementation of Turbo Decoding for Improved Power Efficiency
… to the law of diminishing returns, as the resolution of the analog-to-digital converter (ADC) in the decoder increases, BER improves, but power dissipation increases. The number of decoding iterations has a similar effect on the BER performance and power dissipation of turbo coded systems. …
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Signal Encoding and Digital Signal Processing in Continuous Time
… signal encoding is varied by adjusting the resolution according to a property of the input. A variable-resolution system leads to a decrease in the number of samples generated, a reduction in the power dissipation and a reduction in the effective chip area of a CT DSP, all without …
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Ambient seismic noise imaging using trans-dimensional and machine learning techniques with application to Borneo and Iceland
… inversion schemes, which allow for variable resolution and can estimate posterior uncertainty, though at increased computational cost compared to traditional linearised methods. In the first part of this thesis, I leverage ambient noise data and trans-dimensional methods to …
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Quantitative analysis of nanoscale order in amorphous materials by stem-mode fluctuation electron microscopy
… artifacts, and advanced methods such as variable resolution FEM (VR-FEM) afford some quantitative information on the length scale of the order. Here, we investigate another significant source of experimental non-ideality in STEM-FEM, namely, the electron probe coherence. Although commonly …
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High order hybrid discontinuous Galerkin regional ocean modelling
… flexible ocean modeling, led us to develop new variable resolution, higher-order and non-hydrostatic ocean modeling schemes. Specifically, we derived, developed and applied new numerical schemes based on the novel hybrid discontinuous Galerkin (HDG) method in combination with projection methods. …
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Cross-validation of spaceborne radar and ground polarimetric radar observations
… point observations, propagation frequencies, resolution volume size and time synchronization mismatch between measurements can contribute to direct point-by-point intercomparison errors. The problem is further complicated by spatial geometric distortions induced into the space-based …